Voltmeter dial

Numéro d’image : 11904687
Voltmeter dial
Voltmeter dial. Dial of an old voltmeter designed to measure 0-20 volts. The voltage of an electric current is measured in volts. This unit is named for the Italian physicist Alessandro Volta (1745- 1827). Voltage is the potential difference,also called the electromotive force,measured between two points in a flow of electric current. It can be thought of as a measure of the energy intensity of the current. Early voltmeters,with an analogue dial,were based on galvanometers modified with a high resistance. The voltmeter would measure the electric current,which is related to the electric voltage by Ohm's Law. The first dial galvanometers date from the 1880s
Licence : Droits gérés
Crédit: Science Photo Library / Kinsbergen, Ton
Taille de l’image : 5104 px × 3409 px
Model Release : Non requis
Property Release : Non requis
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